Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a411c91d7dc72fdca0e18c089de15ade66348eb4f4ed625fbe4b65f1e68a747' 
  AND token = 'VJpJzfkRt4g5A5uYLzTx4SxNuL8PNBhMUZ190i4I9Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}